Moisten the parts to be united with soldering fluid; then, having joined them together, lay a small piece of solder upon the joint and hold over your lamp, or direct the blaze upon it with your blow pipe until fusion is apparent Withdraw them from the blaze immediately, as too much neat will render the solder brittle and unsatisfactory. When the parti to be joined can be made to spring or press against each other, it is best to place a thin piece of solder between them before exposing to the lamp.

Where two smooth surfaces are to be soldered one upon the other, you may make an excellent job by moistening them with the fluid, and then, having placed a sheet of tin foil between them, holding them pressed firmly together over your lamp till the foil melts. If the surfaces fit nicely a joint may be made in this way so (lose as to be almost imperceptible. The brightest looking lead" which comes as a lining to tin boxes works better in the same way than tin foil.